Lightning-conductor point and point-rod protector.



` u Y G.- BAJOHR; 'LIGHTNING CONDUCTOR POINT AND POINT BOD PROTECTOR.

APPLIoATIoN kHmm Nov. 1e, '1 9o9'.

'Patented Ju1y5, 1910. -4

- ril wr "v I THE NaRRls ps-rERs ca., wAsmNaroN. u. c.k

' and Fig. 4 is a detail showing, part-ly in sec- UNIrnns'rarns Parana? onirica. i

CARL BAJOHR, or' sr. LOUIS, .russo-ORI.

, LIGHTNING-connucron POINT AND POINT-Ron PROTECTOR.

To all whom it may cof/warn:`

Be it known that I, CARL BAJOHR, a citizen of the United States, resident of St. Louis, in the State of-Missouri,- have inventeda new and ImprovedLightning-Conductor Point and Point-*Rod Protector, of W'hich the following is a full, clear, and exact description.

My invention relates tol` lightning conductors, my more particular` purpose being to provide improved means gby protecting the i lightning conductor points upon' power plant and smelter chimneys from the effects of oxidizing and corrosion, due to the outstreaming fumes ofv nitric, sulfuric and muriatic acid gases, which are present in various gases of combustion, and have a tendency to corrode the surfaces of light-- ning conductor points, thereby vnot only lessening their eiiiciency, butf in time destroying them completely. l

More particularly stated, I make a platinum tipped point whichfll mount upon a point rod, and then providea tubular jacket made of graphite, retort; or coal carbon,

which incloses the whole point rod from the bottom part of the platinum tip to the copper cable lightning ".conductor circuit.` Such points resist the action of all acid gases. This tubularjacketbeing made of conducting carbon, serves,V as a shield for preventing the deposit, `upon the portion of the lightning conductor point and point rod inclosed by 1t, of any substance either made up of, or formed by, any acid fumes deleterious to the part thus inclosed.

Reference is to be hadto the accompanying drawings, forminga part of this spec-ification, in which similarwcharacters ofreference indicate corresponding parts in all the figures. E] s l.

Figure 1 is a fragmentary perspective showing the top of a chimney equipped with lightning conductors, and employing a number of my lightning `conductor points; Fig. 2 is a section` through one of the platinum points with its copper point rod and carbon protector; Fig.v 3 is a detail l,showing in sec-` tion the manner in whichthe lower end of the tubular protector isfitted in position;

tion, the fitting of the cone carbon with the carbon tube, to the platinum tipped section.

At 4 is a large chimney, which is provided with areduced annular portion 5 and with SpecificationV of Letters Patent form.

Patented July 5,1910.

Application led November 16, 1909. Serial No. 528,349.

a crown 6. Resting upon the crown 6 and encircling the reduced portion 5 is a copper cableconductor circuit 7, having generally ing into this neck and secured firmly byV having a thread cut into it, isa rod. 13, screwed in and secured by aid of hard solder. The upper end of this rod is threaded as indicated in Fig. 3. The lightning rod point is shown at 14, Vand has generallya conical to screw upon the upper threaded portion of the rod 13, as indicated in Fig. 3. vAdj acent to the lower end of the lightning rod point 14 is an annular bead 16. The upper portion of the lightning rod point 14 is shown at 17 and tapers ofi" gradually. It' is provided with a shoulder18, and abutting this shoulder is a tip or thimble 19 of platinum, which thus constitutes the outer or exposed surface of the lightning conductor point, as will be understoodf'rom Figs. 2 and 4.

A tubular shield 20, made of graphite,re tort or coal carbon, and having an internal dia-meter somewhat larger than that 0f the Y The lower end v15 of this member isv Ymade hollow, and threaded internally so as rod 13, is'iitted over the rod 13 and thel lower portion of the lightning vrod point. The bead 16 engages thevinternal surface of` the tubular shield. A closure plug 21, having its upper end rounded, is provided with a reduced threaded portion 22, which ts into the upper end of the tubular shield 20, this upper end being threaded internallynfor the purpose. The outer surface ofthe closure plug 21 is thus brought iiush with the outer surface of the tubular shield 20. The closure plug 21 is provided with an opening extending axially-through it and this opening slightly overlaps the shoulder 18, and

Athe lower portion ofthe platinum tip 19, as

will be understood from Fig. 2.

The closure plug 21 fits so closely around the metallic parts which itencircles, as to Y prevent ingress of water. If, however, any

water should creep in through the closure plug, it can do no harm, for the reason that the bottom of the tubular shield 2O is open, and permits a free escape of Water.

they do, various acids and other corrosive substances deleterious to metals) lodge upon the lightning conductor point and point rod, y

then they can do no harm whatsoever.

The tubular shield 20, because of the .ma

terial of which itis made, is impervious to attacks from acid, or from other corrosive substances, and is not injured in the least by agencies of this character. The upper portion of the lightning conductor point ben ing covered with platinum is, of course, im-

mune from all corrosive influences, and the lower portion of the point is completely protected, as' above described, by the tubular shield 20, and the closure plug 21. The bead 16 serves to space the tubular shield 20 soy as to maintain it always concentric with the rod 13 `and the lightning conductor point.

If, for any reason, it be desired -to remove the point, this is easily accomplished by rst taking out the'closure plug 21.

The parts may be assembled as'indicated in Fig. 1, and thereafter placed in position as a unit, the point rod connection 11 being properly secured to the cable and the tubular shield being otherwise braced or sup-l ported in any approved manner, for m- Ystance as indicated in F ig. 1. I/Vhile Vthe other materials.

parts inclosed by the tubular shield 2O are in this'instance made of metal, I do not limit myself thereby, as obviously these .1. The lcombination of` an electrode, a

point connected therewith and provided with an annular bead of greater diameterA than Y the general diameter of said point, a tubular member of carbonaceous materialv encircling said bead and aY portion ofY said electrode,

and al closure plug engaging said tubularV member and also engaging said point.

"2. The combination of a tubular shield made of carbonaceous material, a closure plug fit-ted upon one end of said shield, and a lightning point extending into said tubular shield and engaging said closure plug.

3. The combination of a tubular shield` made of carbonaceous material, a closure plug connected with said shield, and a lightning point extending through said plug and havingv av substantially conical form at the If, now, j heated gases of combustion (containing, as

` point ywhere it thus extends through said@ *.plug. Y u Y a. 'Ihe combination of an electrode provided-with a thread, a lightning point prov i vided with a thread mating said thread of y i Y tube of carbonaceous material*` Vencircling said electrode and said lightning point, and

point and engaging said tube. .Y

5. 'Ihe combination of a `provided at one of its ends with ai.' thread, a` l closure plug provided Vwith a threadengag- 1 ing said thread of said tubular shield, saidf "said electrode, said lightning point V"bein:

further provided with an annularbead,a s

Va closure member encircling said lightningV tubular ishieidclosureplug being further provid'edfwith a shoulder engaging the adjacentend o f said tubular shield, said plug being further provided with a substantially -conicalaperture extending through it, and a lightningv'point i partially housed within. said tubular-mem-- ber andextending through said plug, said.l

lightning point having 'a substantially con'' ical form where it engagesfsaid plug. Y 6. The' combination of a tubular shield,:afi

lightning point partially housed therein and y extending therefrom, said lightning'point being provided with an annular bead for the purpose ofspacing'it centrallyrwithin said; p tubular shield, and a closure member encir- 2 cling said lightning point ,andspacing the-f* same centrally in relation to said -tubulary' l 7. Thecombination of a` tubular shield,al

shield. Y v l closure member therefor, a lightning-,point v having a platinum tip and partiallyV housed within said tubular shield, anda closure;

V small portion lofsaid platinum@ member engaging saidV tubular.v shield and covering a tip.

8.v 4The combination of atubular'i'shield, a'if i lightning point housed partially therein andA i *l 1 i' being provided with a platinum sheath; upon y extending therefrom, said .lightning pointv its upperend, and a closure member engaging said tubularshield and ,overlapping-the Y adjacent end of said platinum sheath. j l

9. vThe combination of a tubular' shi eld, a

lightning point partially housed therein and 7 having a sheath of non-corrosive material,Vl

andV a'closuremember mounted uponfsaid y 115VV Y tubular shield andoverlappingthe.adjacent end of said shield. 1

In testimony whereof I have signed.

extending therefrom, said lightningvpoint Y name to this specification inthe Ypresence'of two subscribing witnesses;

Witnesses:V v

OSCAR GRIMM, Y GEORGE PAUKAN. y

calin isiuioiii.l f f Y r 

